package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Employee;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * 菜品和口味业务层
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    // 新增菜品和口味数据
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        log.info("新增菜品：{}", dishDTO);
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 向菜品表插入一条数据
        dishMapper.insert(dish);
        // 获取生成的主键值
        long dishId = dish.getId();
        // 批量插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        for (DishFlavor flavor : flavors) {
            flavor.setDishId(dishId);
        }
        if (flavors != null && flavors.size() > 0) {
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);

        }

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能删除 -- 是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 存在起售中的菜品，不能删除，抛出业务异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        // 判断当前菜品是否能删除 -- 是否被套餐关联？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 存在关联的套餐，不能删除，抛出业务异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


        // 删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            // 删除口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }


        // sql: delete from dish where id in (1,2,3)
        // 根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        // sql: delete from dish_flavor where dish_id in (1,2,3)
        // 根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        dishVO.setFlavors(flavors);
        BeanUtils.copyProperties(dish,dishVO);
        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        // 先根据菜品id删除口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            // 为每个口味设置菜品id
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishDTO.getId());
            }
            log.info("修改菜品：{}", dishDTO);
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder().
                categoryId(categoryId).
                status(StatusConstant.ENABLE).
                build();
        return dishMapper.list(dish);
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
